diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp
index 4062f02..a5ddd49 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp
@@ -89,7 +89,7 @@ update the voltMeterConstant variable in pP_config.h with the correct value
 #include <EEPROM.h>
 #include "LightChrono.h"
 #include "pP_pins.h"
-#include "pP_config.h"
+// #include "pP_config.h"
 #include "pP_volatile.h"
 #include "pP_function.h"
 #include "pP_serial.h"
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.cpp b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.cpp
new file mode 100644
index 0000000..1906e14
--- /dev/null
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.cpp
@@ -0,0 +1,36 @@
+#include "pP_volatile.h"
+#include "pP_config.h"
+#include "stdint.h"
+
+// these variables will change on their own. Do not edit ANYTHING below this line
+volatile int sensorHReading = 0;      // variable to store the value read from the sensor pin
+volatile int ADJ_FOLLOW = 0;          // Variable for Follower adjustment
+volatile int ADJ_COMP = 0;            // Variable for Comparator adjustment
+volatile int ERR_STATE = 0;
+volatile int PZ_STATE = 0;
+
+int Vin = 5000;                   // input reference voltage in millivolts (multiply V by 1000)
+int VOld = 5000;                  // Variable to store previous cycle's Vin
+int VLast = 0;
+
+// Convert threshold values based on the input voltage
+
+long followerLong = followerThrs * 1023L;
+long compLong = compThrs * 1023L;
+
+// Voltage Comparator Adjustment parameters
+int VComp = 0;
+
+// Voltage Follower Adjustment parameters
+int VFol = 0;
+
+// Error blink parameters
+
+int BlinkState = 0;
+int BlinkCount = (InitCount * 2) + 1;   // Multiply Blink count by 2 to handle toggle state, add one extra to make sure light is on after
+
+// Serial Input Parsing Variables
+uint8_t bytesRecvd = 0;
+bool serialIncoming = false;
+char serialMessageIn[buffSize] = {0};
+long serialLong = 0;
\ No newline at end of file
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h
index ac1c5eb..7dd9c27 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h
@@ -2,44 +2,45 @@
 #define PP_VOLATILE_H
 
 #include "LightChrono.h"
+#include "stdint.h"
 
 // these variables will change on their own. Do not edit ANYTHING below this line
-volatile int sensorHReading = 0;      // variable to store the value read from the sensor pin
-volatile int ADJ_FOLLOW = 0;          // Variable for Follower adjustment
-volatile int ADJ_COMP = 0;            // Variable for Comparator adjustment
-volatile int ERR_STATE = 0;
-volatile int PZ_STATE = 0;
+extern volatile int sensorHReading;      // variable to store the value read from the sensor pin
+extern volatile int ADJ_FOLLOW;          // Variable for Follower adjustment
+extern volatile int ADJ_COMP;            // Variable for Comparator adjustment
+extern volatile int ERR_STATE;
+extern volatile int PZ_STATE;
 
-int Vin = 5000;                   // input reference voltage in millivolts (multiply V by 1000)
-int VOld = 5000;                  // Variable to store previous cycle's Vin
-int VLast = 0;
+extern int Vin;                   // input reference voltage in millivolts (multiply V by 1000)
+extern int VOld;                  // Variable to store previous cycle's Vin
+extern int VLast;
 
 // Convert threshold values based on the input voltage
 
-long followerLong = followerThrs * 1023L;
-long compLong = compThrs * 1023L;
+extern long followerLong;
+extern long compLong;
 long followerInt;
 long compInt;
 
 // Voltage Comparator Adjustment parameters
-int VComp = 0;
+extern int VComp;
 
 // Voltage Follower Adjustment parameters
-int VFol = 0;
+extern int VFol;
 
 // Error blink parameters
 
-int BlinkState = 0;
-int BlinkCount = (InitCount * 2) + 1;   // Multiply Blink count by 2 to handle toggle state, add one extra to make sure light is on after
+extern int BlinkState;
+extern int BlinkCount;   // Multiply Blink count by 2 to handle toggle state, add one extra to make sure light is on after
 
 // Serial Input Parsing Variables
 #define buffSize 40
 char inputBuffer[buffSize];
 #define endMarker '\n'
-byte bytesRecvd = 0;
-bool serialIncoming = false;
-char serialMessageIn[buffSize] = {0};
-long serialLong = 0;
+extern uint8_t bytesRecvd;
+extern bool serialIncoming;
+extern char serialMessageIn[buffSize];
+extern long serialLong;
 
 //#define LOW 0
 //#define HIGH 1